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(No Model.) 2 Sheets-Sheet 1..

.J.H.EHLE.

GRINDING MILL.

-N0. 266,116. Patented 0013.17, 1882.

I 0 x 1,73 |NVENTE1F\ why/m2 (No Model.) 2 Sheets-Sheet 2'.

J. H. EH LE.

GRINDING MILL.

No. 266,116. Patented 0011.17, 1882.

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Hlllllll \NIT NE55E5 NHE STATES Farmer JOHN H. EHLE, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF 'IO FRED- ERICK A. BATTEY, OF SAME PLACE.

GRlNDlNG-MlLL SPECIFICATION forming part of Letters Patent No. 266,116, dated October 17', 1882.

Application filed August 18, 1882. (No model.)

To all whom it may concern:

Be it known that I, JOHN H. EHLE, of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Grinding-Mills; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon,

which form a part of this specification.

This invention relates to grinding-mills of the cylinder and concave class. More particularly it relates to features of construction in the side plates of the cylinder, taken in conjunction with the side plates of the concave,

having for its ultimate object to insure the uniform reduction of the entire body of material that passes through the mill. It also in particular relates to devices foradjusting the concave to position, and still further to features of construction in the frame or housing and other parts whereby the concave may be conveniently removed from the housing without disturbing the cylinder in its bearings.

The special matters in which the invention consists are hereinafter fully set forth, and pointed out in the claims.

In the drawings, Figure l is a perspective view of agrinding-mill containing myimprovements. Fig.2 is avertical section through the axis of the cylinder, or through 3 y of Fig. 3. Fig. 3 is a central vertical section transverse to the axis of the cylinder, or in the line 1; e of Fig. 2. Fig. 4 is a partial horizontal section through as 00 of Fig. 3. Fig. 5 is a fragmentary horizontal section of the housing'and frame, taken anywhere above the bridge-tree, the superposed parts being removed. Fig. 6 is a fragmentary elevation of one of the uprights A detached. Fig. 7 is a perspective view of the lower cross-bar belonging to the removable end piece of the housing, showing theform of the ends of said cross-bar by which it is adapted to engage with the shoulders of the 5 rear uprights of the frame.

A A A A is the frame, and a a are panels at the sides and one end, forming three parts of the housing for the working parts.

B is the cylinder, mounted on a shaft, B,

which rests in bearings upon the upper horizontal frame-piece, A, and B are metal disks between which the stone B is confined.

O is the concave stone. 0 are-the side boards of the box in which the said concave is contained. (l is the bottomboard of said box; 0 its rear end board; and 0 may represent the cement by which the stone is bedded 01' secured in the box.

E is the bridge-tree upon which the concave rests.

E is an arm projecting from the bridge-tree at the rear end of the machine, to afford attachment for the tram-rod F, and E is a crossbar, and E are wedges by which the front end of the bridge-tree is supported.

D is the rear end piece of the housing, having attached thereto the frame-pieces d, d, and (1 The lower one of these framepieces rests on and behind shoulders cut in the uprights A, and its upper end is held in place by inward bearing against aremovable cross-piece, D and by buttons d (Seen in Fig. 1.) The end piece, D, thus held in place, in turn supports the rear end of the bridge-tree by means of the projecting metal piece D, affording at- 7 tachment for the upper end of the adjustable tram-rod F.

The cylinder B is secured on the shaft B by the following means, to wit: The shaft B is provided with a fixed collar, 1), against which rests the contiguous clamping plate or disk B preferably recessed to admit the same. On the opposite side of the stone B the shaft B is screwthreaded at b, and the second disk, B is correspondingly threaded andrun up against the stone by being rotated as a nut; or aseparate nut may be employed exteriorto this disk. Nothing novel is claimed in this mode of securing the cylinder-to its shaft.

For the purpose of protecting the exterior o edges ofthe cylinder from fracture or chipping, which is common in this class of mills as heretofore constructed, the disks B are extended to the full diameter of the several circular faces of the cylinder, as shown in the several figures 5 turned off, and also for the purpose of ahordl tree below the end piece, 1),andis alsocngaged ing room for the extended lateral walls of the concave. Said walls of the concave are preferably of wood, and rise above the concave fat: 2: short distance-say th ce-eighths or half an inch, or ther about-in proximity to and embracing the margins of the disks 13'. By this means the grain being ground is prevented from lateral escape from between the grinding-faces in its passage through the mill.

The lateral walls of the concave elevated to (unbrace the sides of the cylinder for a short distance to prevent the escape of the material being ground is afeature of construction not in itself new; but the combination, with such extended concave ails, of the cylinder having its end disks, 11 extended to the exterior edges of the cylinder and embraced by said walls is claimed as a part of my invention. The ultima to object of thus protecting the edges of the cylinder from fracture is identical with that of the projection of the side walls, 0, of the concave above the face of the stonenamely, to prevent the passage through the mill of material unground or only partly gronndfor it is obvious that when the edges of the cyllinder are broken away space is afforded in which grain may lodge and escape reduction, even if theconcavo walls extended, asshown. The extended cylinder-disks .3 therefore cooperate with the extended concave walls toinsnre the effect desired.

In this class of griuding mills as heretofore constructed the concave, when removed from the housing, is lifted out vertically. This usually necissitates first removing the cylinder, and in any use is lal'iorions,inconvenient, and for other reasons objectionable. In order to obviate the necessity for thus lifting the concave the end'piece, D, of the housing is made removable from the frame, so as to open a passage through which the concave may be drawn out between the rear uprights, A, of the mill. \Vhen the front end :it' the concave rises above the lowest point of the cylinder, as shown in the drawings, and as is commonly and preferably the case in this class of mills, the bridgetrec E is also adapted to be sufficiently lowered to allow the front end of the concave to escape the cylinder. As here constructed the panel or end piece, 1), is provided with the lowe: cross-bar, d, (seen detached in Fig. 7,) having a notch, d7. The rear uprights, A, are reduced in thickness laterally from the point of, Fig. 0, upward, and the shoulder ltd lS1UZttl0 to conform with the under notched face of the crossbar cl; or, in other words, the projection d on each end of the cross-b r sctsin the notch a. of the adjacent upright A. At its upper end the end piece, D, rests against the removable cross-bar D and is held from falling out wardly by the buttons d, Fig. 1. The cross-- bar D rests in notches cut in the upper faces of the horizontal frame-pieces A.

The tram-rod F engages removably and in the usual manner with tlie arm E, attached to and rcarwardly projecting from the bridgewith the projecting metal plate 1), attached to said end piece, shown, at its upper extremity,where.it is provided with the screw-threaded hand-wheel l of fluniliar construction. \Vhen it 's desired to remove the concave the tramrod is diswnnected, which allows the arm E to fall upon the permanent cross-beam A of the fran'ic, and the end piece, 1), and the crossbar ii are removed. The rear on d ofthe housing being thus opened, the concave is slid out upon the bridgctrec between the uprights A, and it is returned to its place by the same passage.

As a means of thrusting the concave forward at the same time that it; is lifted by the tram-rod ii, the concave is provided with a wedge-shaped piece, 0', having its thicker part atthcbottoin. This wcdgciiece bears against the cross-bar D or against the removable back piece, I), having its inneror front face projected forwartll from bottom to top, so as to bear more or less fairly against the inclined face of the wedge C, as shown in Fig. 3. \Vhen thebridgetree and concave are raised by means of the tra n-rod F, therefore, the concave is made to slide forward. on the bridgetrce and adjusts itself uniformly to the face of the cylinder. The wcdgeshapcd block 0 may be permanently secured to the box of the concave, thus forn'iing an outwardly and downwardly inclined rear wall ofsaid box or concave; or said bloolt ma 7 be loose or detached, in which or so, however, when in place it obviously has the same effect when permanently fastened to the bacl: of the concave.

The bridgetree is transversely grooved to receive the upper beveled edge of the support in cross-bar E", and is thus held from rearward motion or displacement. The height of the front end of the bridge-tree is made variable by mea s of wedges 10, inserted beneath the cross-bar E in the vertical slots (0, out; through the lower horizontal frame'picce, A, for their reception.

The remaining parts of the machine present nothing claimed to be new. The hopper A is mounted in the usual manner in the rectangular frame a, supported by the uprights A, and a. spout, c", conducts the grain to the grindingsurfaces. A pat-sage, l through the bridge tree (or 'at its end) gives outlet to the ground product, and a suitable spout (not shown) may be attached to the frame to conduct it in either direction. The cylinder is rotated by a beltpulley on the shaft 13. (Not shown in the thawin l claini as my 'nvention--- l. The combination, with the concave G, and with its lateral walls G extended above the worltinn-face of the stone, of the cylinder 1;, al end plates, 13", extended c cylinder, so as to be cmr ecting walls of the concave, described, and for the purposes i J substantiall i' set forth. I

2. In a cylinder and concave grinding-mill,

form 116 3 the combination, with a removable concave, of a removable rear end piece of the housing, whereby the concave may be passed out or in atthe end of the machine, substantially as described.

3. In a cylinder and concave grinding-mill, the combination of the cylinder B, the removable concave O,rising at its front end above the lowest point of the cylinder, a bridge-tree, E, adapted to be lowered so that the concave may clear the cylinder when drawn out rearwardly, and a removable end piece, D, of the housing, substantially as and for the purposes set forth.

4. In a cylinder and concave grinding-mill,

the combination of the cylinder B, bridge-tree 15 E, tram-rod Ii, concave (J, provided with a downwardly and outwardly inclined rear wall, and a stationary part of the frame, as D, whereby when the bridge-tree is lifted the concave is both raised and thrust forward, substantially as described.

In testimony that I claim the foregoing as my invention I atfix my signature in presence of two witnesses.

JOHN H. EHLE.

Witnesses M. E. DAYTON, JESSE 00X, Jr. 

